Boiler check-valve.



110.846.213. PATENTBD MAR; 5, 1907.' L KASSANDER BOILER CHECK VALVE.

A1II.\I(JATI0N FILED NOV. 30. 1906.

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' vfelszf 10.846,213. vPATENTED MAR.5,1907. L, KASSANDER.'

BOILEROHEGK VALVE.

APPLICATION FILED NOV..30, 1906.

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UNITED STATES PATENT OFFIOE.

LEOPOLD KASSANDER, OF NEW YORK, N. Y., ASSIGN OR TO NATI-IAN MANUFACTURING COMPANY, OF NEW YORK, N Y.

BOILER CHECK-VALVE.

Specification of Letters Patent.

Patented March '5, 1907.

To LZZ whom t may concern:

Be it known that I, LEOPOLD KAssANDER, a citizen of the United States, residing in the city, county, and State of New York, have invented a certain new and useful Improve* ment in Double Boiler Check-Valves, of which the following is a specification.

The invention relates to boiler checkvalves used on locomotives to prevent the backflow of the water from the boiler to the injectors which supply the water to the boiler, and more particularly to such boiler check-valves as are designed to be placed upon the back head of the fire-box of the boiler.

In recent locomotive practice it is customary to provide the locomotive-boiler with two injectors, thus necessitating two boilerchecks, one for each injector, and when, as is very often the case, the injectors as well as the boiler-checks are located at the rear head of the fire-box, owingto limited space, there is considerable difficulty in providing the necessary fittings and intermediate parts. Injectors as a rule are provided at their delivery ends with check-valves contained within the confines of the injector-body, so that if anything should be amisswith the boiler check-valve itself the check-valve in the injector will prevent a backflow of the water from the boiler. In the nature of things this check-valve in the body of the injector must be limited in size and as a rule cannot be as substantial in form and construction as is desirable. When the injector is shut down, the sudden confining of pressure in the pipe .between injector and boiler produces the sudden closing of the check-valve in the injector-body with a strong pounding effect, -the result being that this small and necessarily weak valve does not wear well and very often breaks, interfering with the proper function of the injector and its very important work of supplying the boiler with the necessary amount of water. When the injector is placed on the back head of the boiler, the reduced distance between injector and boiler still further intensifies the effect of the back pressure upon the checkvalvein the injector.

The-obj ect of my inventionis to overcome .all .these difliculties by so constructing the boiler-check thatit shall be double`that is `tosay,shallhave for eachinjector a separate and distinct boiler check-valve by `providing in connection with each of said valves an intermediate check-valve ofsubstantial design and also a stop-valve, all contained within a single casting and combined in compact and eflicient form and arrangement, with an outlet or discharge which is common to the two lines of supply controlled `by the two systems of check-valves.

To enable those skilled in the art to understand my invention, vI will now proceed `,to describe the saine in detail in connection with the accompanying drawings, is which Figure 1 is a general view, .partly inv end elevation and partly in verticalsection, of ya locomotive-cab, showing two injectors and a double boiler check-valve on the back head of the boiler. No structural details are shown, the figure being largely diagrammatic and designed to indicate graphically the limited space in which these instruments must be contained. The remaining figures are drawn on a larger scale and exhibit the-struc- `tural details of a double boiler-check embodying my invention. Fig. 2 isa vertical section of my improved boiler-check on line 2 2, Fig. 4. Fig. 3 is a vertical section on line 3 3, Fig. 2. Fig. iis ahorizontal Section on line 4 4, Fig. 2. Fig. 5 is a horizontal section on line 5 5, Fig. 8. Fig. 6 is a section of a portion of the valve casing or bodyon line 6 6, Fig. 3. Fig. 7 is a face elevation of the flange at the boiler end of the deliverychamber, by which the valvecasing or bod is attached to the boiler. In all of these Figs. 2-7, inclusive, parts which are not in the line o f section are omitted for purposes of clearness.

In Fig. l, a a represent two injectors, and b a double boiler-check. It is lapparent from this illustration that space is so limited that in most cases no intermediate `device external to the boiler-check can be applied between injector and boiler-check in case it should be desired to dispense with the unsatisfactory check-valve in the body of the injector at its delivery end. In my improved double boiler-check, which I shall now proceed to describe in connection with Figs. 2-7, provision is made for the convenient application and use of such devices.

which is internally divided, generally .considered, into two completely-separate sec- IOO c is the body of a double boiler-check,.

two check-valve chambers g. The primary chamber is designed to be in direct commui nication with the delivery end of its appropriate injector, the latter to be directly attached to the receiving end c' of said chamber, which is internally threaded for this purpose. Between the primary chamber and intermediate chamber is placed an automatic checkvalve c, and between the intermediate chamber and check-valve chamber is placed the automatic check valve Z. Between each check-valve chamber and the deliverychamber, which latter, as above said, is common to the two halves of the check-body, is placed a stop-valve m, which controls communication between its check-valve chamber and the delivery-chamber.

To secure compactness and efficient arrangement, the two series of chambers are placed side by side in the body or shell of the double check, separated the one series from the other by a vertical partition web or wall d, and in each series the three chambers are superposed one on the other, the primary chamber c below, the intermediate chamber next, and the check-valve chamber g on top.

The valve Z in the top chamber g corresponds to the ordinary boiler check-valve and is of the usual flat-seated 0ravity type. It is provided with a removabzle horizontal seat located in an opening in the bottom of the chamber, through which communication is had with the intermediate chamber f next below. The valve and seat are accessible through an opening formed in the top of the body and closed by a screw cap or plug Z2, as usual in this class of instruments.

rihe intermediate valve k is of the type known as a swing-valve. It consists of a bevel-seated valve proper, 7c, provided with a cylindrical stem c, mounted in an annular bearing-sleeve on the free end of a swmgmg arm 7c3, wherein 1t 1s sustained by a lock-nut V7a2 in such manner as to be capable of free axial rotation. The swinging arm k3 is pivoted or hinged at k to the interior of the valve-body. The valve 7c seats on a seat 765, screwed into a partition-wall, which separates chambers e and f. This seat is removable and renewable whenever occasion should require. The seat and valve are inserted through an opening covered by cap k6.

By reference to Fig. 3 it will be seen that the seat cf is as a whole set at an inclination to the horizontal, being inclined upwardly in a direction from front to rear of the shell or body of the boiler-check, and the portion of the partition-wall between the chamber e below and the chamber f, in which it is se ated,

is correspondingly inclined. The opening through which this valve and seat can be reached (closed by the cap or plug k6) is formed in the front wall of the shell at a corresponding inclination to and in axial alinement with the seat lcs. By thus arranging the parts access may be had at any time to the intermediate valve, notwithstanding the fact that the chamber in which it is located is interposed between the primary chamber c below and the check-valve chamber g above.

Both top chambers g communicate through separate openings with deliverychamber h, formed in the casting or valvebodyand each opening is controlled by its own stop-valve m, as indicated more plainly in Fig. 4, so that either half of the double check can be shut off from the boiler without interfering with the free communications of the other half.

Each stop-valve fm is of the usual bevelseated screw-spindle type and needs no further description. It is of course provided with the usual operating-handle on the outer end of its spindle, as indicated in Fig. 4.

The check-body is attached to the back head of the boiler by means of the flange n, surrounding the boiler end of deliverychamber h and provided with bolt-holes n, through which pass bolts screwed into a flange which is riveted to the boiler in the usual and well-known manner. Y

In practice the operation of the device will be as follows: With valves m open and the injector in operation, thewater pressed into the check-body by the injectors will open successively valves c and l and pass through chambers'e,f, g, and h into the boiler. Then the operation of either injector is stopped, back pressure from the boiler will automatically close the valves Z and 7c appropriate to it and prevent a backflow of the water from the boiler through the half of the double boiler-check.

Both valves c and Z may be constructed in equally substantial and strong manner, so that when either one is out of order from any cause the other will perform the functions of a boiler check-valve, which the ordinary, and necessarily small and weak, valve in the injector-body could not perform. The latter valve may therefore be dispensed with and all annoyances resulting from its necessarily unsatisfactory construction, location, and operation avoided. Placing both valves 7c and Z into the same body also makes it necessary to employ a detached and independent valve in place of valve c, which method has heretofore been resorted to occasionally when conditions of space have permitted it. This possibility of dispensing with an independent valve greatly simplifies matters, as an inde endent valve would require two addtiona joints in the pipe between injector IOO IIO

IZO

and boiler-check for each side or half of the check-altogether, therefore, four additional joints-which fact would cause multiplication of parts, largely increased expense in the installation of the boiler-feeding apparatus, and create opportunity for leaks in these extra joints, and thereby increase the cost oi maintenance. I avoid all this by placing all valves which are necessary in connection with the proper feeding arrangement of a locomotive-boiler in a single casting, therebyT reducing` the number of parts, the cost of arrangement, and the cost of its maintenance in good order to the lowest possible limit.

Should it be necessary to examine or remove either one of the valves llc or Z for repairs with steam in the boiler, this can be accomplished by closing either one or the other of stop-valves m, as the case may be, thus shutting off communication between the boiler and the various valve-chambers in that half of the check-body to which the stopvalve pertains.

Vhile I have described and illustrated only the preferred form of my invention, and particularly its application to boiler-checks located on the back head of the boiler, it is obvious that the invention may be applied to boiler-checks placed on the side of the boiler an'd that modifications in the construction of the check-body and of the different valves may be made without departing from the nature and spirit of my invention.

In conclusion I state that I do not claim, broadly, a double boiler check-valve in which the shell is provided with a plurality of independent feed-water passages and a delivery bore or chamber common to said passages in combination with checks automatically controlling said passages, respectively, and a separate and distinct stop-valve for controlling communication between each passage and the delivery bore or chamber; but

that I claim herein as new, and desire to secure by Letters Patent, is as follows:

1. In a double boiler check-valve, a valvebody divided vertically into two distinct and separate series of three superposed communicating chambers-a primary chamber be- I low, an intermediate chamber and a checkvalve chamber above-a check-valve in the intermediate chamber accessible through a cap-closed lateral opening in the walls of said chamber, a check-valve in the check-valve chamber accessible through a cap-closed opening in the top of the valve-body, a delivery-chamber common to and communicating with the check-valve chambers of each series, and a separate stop-valve for controlling communication between the delivery-chamber and each check-valve chamber, substantially as set forth.

2. In a boiler check-valve having a shell provided with check-controlled superposed communicating chambers e, f, g as described, an inclined valve-seat k in the intermediate chamber f, a check-valve hand a correspondingly-inclined cap-closed lateral opening in the wall of the shell in substantially axial alinement with said valve-seat, substantially as and for the purposes hereinbefore set forth.

In testimony whereof I affix my signature in presence of two witnesses.

LEOPOLD KASSANDER.

Witnesses:

LEO ARNsTEIN, W. L. ABATE. 

